Isuzu Motors Limited

Naoya Ishikawa

Yutaka Uematsu

Teruo Nakada

Jin Yokoyama

Naoki Shimazaki

Junichiro Nitta

Tetsuya Honma

Masato Honda

Takeshi Kikuchi

Ryu Hariyoshi

A gear device in which lubricating oil for cooling and lubricating gears to be driven therein is adjusted to a temperature and an amount suitable for the speed of a vehicle, and a vehicle having the gear device mounted thereon. A transmission adjusts the temperature of lubricating oil by supplying the lubricating oil from a lower part of a housing of the transmission into a heat exchanger by a circulation pump and causing the lubricating oil and engine cooling water to exchange heat with each other in the heat exchanger. A level of the lubricating oil retained in an oil pan when the circulation pump is stopped is defined as a highest oil level, while the level of the lubricating oil retained in the oil pan when the amount of the lubricating oil pumped up by the circulation pump is maximum is defined as a lowest oil level. The heat exchanger is disposed at a position outside the housing and higher than the highest oil level. The transmission includes a device which controls the amount of the oil to be pumped up by the lubricating pump to adjust the height of the level of the oil which varies between the highest oil level and the lowest oil level.

Gear device and vehicle having same mounted thereon

A sequential-type, two-stage supercharging system () having a high-pressure-stage turbocharger () and a low-pressure-stage turbocharger (), in which high-pressure-stage exhaust gas bypass passages () for bypassing a high-pressure-stage turbine () is formed by both the first bypass passage () having a small-diameter valve () and the second bypass passage () having a large-diameter valve () with a diameter greater than that of the small-diameter valve (). The effective valve area of the small-diameter valve () is set to 9.5%-26.5% of the passage cross-sectional area required when exhaust gas is at its maximum total flow rate. This allows, in medium speed/medium load operation, fine EGR rate control and air-fuel ratio control.

Two-stage supercharging system for internal combustion engine

A control device is provided that controls the injection quantity and injection timing of fuel injected into the cylinder of a diesel engine, in which are provided two control modes of: a normal injection mode in which the injection quantity and injection timing are controlled so that the injected fuel ignites near compression top dead center during an injection period; and a premixed injection mode in which the injection quantity and injection timing are controlled so that fuel injection is completed before compression top dead center and the injected fuel ignites near compression top dead center after a premixing period, and target values of control parameters (pilot injection timing, and the like) are set in advance separately for each control mode, the control device comprising change means for gradually changing target values Vof one control mode into the target values Vof the other control mode when switching from one control mode to the other control mode.

Diesel engine control device

An engine control method and an engine control system that can inhibit the emission of NOx and reduce noise are provided. An engine control method in which an engineis caused to perform diffusion combustion at normal times and switched from diffusion combustion to premixed combustion when an engine load is low, wherein when the engineis switched from the diffusion combustion to the premixed combustion, an oxygen concentration in an intake air of the engineis found and when the found oxygen concentration exceeds a threshold of NOx generation oxygen concentration that has been set in advance, switching from the diffusion combustion to a fuel injection mode of the premixed combustion is stopped, and when the found oxygen concentration then becomes equal to or less than the threshold of NOx generation oxygen concentration, switching is performed to the premixed combustion.

Engine control method and engine control system

In a diesel engine control device, a normal injection mode that implements normal combustion and a premixed injection mode that implements premixed combustion are set, the normal injection mode is implemented when the actual engine operating conditions are in the normal region, and the premixed injection mode is implemented when the actual engine operating conditions are in the premixed region. When one control mode is being implemented in the corresponding engine operating region, the control mode is forcibly switched to the other control mode when the engine enters a predetermined transition state. This makes it possible to switch earlier than normal, and in particular when accelerating, the desired acceleration performance can be obtained.

A diesel engine having: a reentrant type cavitydepressed in the top of a piston; fuel injection meansthat injects fuel towards the cavity; exhaust gas recirculation meansthat recirculates a part of the exhaust gas into a combustion chamber; and a control devicethat controls the fuel injection timing by the fuel injection meansand the EGR ratio or EGR quantity by the exhaust gas recirculation means, wherein in a predetermined operating region, the control deviceimplements premixed combustion by controlling the fuel injection timing by the fuel injection meansso that fuel injection is completed before the compression top dead center of the pistonand so that all the injected fuel enters the cavity, as well as controlling the EGR ratio or the EGR quantity by the exhaust gas recirculation meansso that the fuel injected by the fuel injection meansis ignited near the compression top dead center of the pistonafter injection of fuel is completed. In this way, favorable premixed combustion can be implemented, and favorable combustion can be ensured even when the combustion is switched to diffuse combustion.

Diesel engine

A diesel engine comprises an EGR valve, an intake throttle valve, a control unit for controlling those EGR valve and intake throttle valve, and a detection unit for detecting the intake air quantity upstream of an EGR gas inlet portion, the diesel engine implementing a premix combustion at least in the prescribed operation region. The control unit, at least in the operation region in which the premix combustion is implemented, determines a target intake air quantity necessary for igniting the gas mixture at the target timing based on the engine operation state and controls the intake throttle valve and/or EGR valve so that the actual intake air quantity detected by the detection unit matches the target intake air quantity. As a result, the ignition timing of the fuel in premix combustion can be easily and optimally controlled.

An EGR system for an internal combustion engine provided with a first EGR passage for recirculating EGR gas to the downstream side of a compressor from the upstream side of a turbine of a turbo-charger is provided with a second EGR passage for recirculating EGR gas from the downstream side of the turbine to the upstream side of the EGR gas, and provided also with a DPF in the second EGR passage, while the exhaust gas flow in the first EGR passage and the second EGR passage is controlled based on the exhaust gas temperature detected by an exhaust gas temperature sensor arranged in the exhaust gas passage.

EGR system for internal combustion engine provided with a turbo-charger

A compression-ignition internal combustion engine for conducting pilot injection and main injection beyond the top dead center, wherein pilot injection quantity and timing are optimized. A compression-ignition internal combustion engine, comprising a fuel injection valve for injecting fuel into a combustion chamber in a cylinder, the quantity and timing of the fuel injected through the fuel injection valve being controlled based on engine operating conditions; wherein pilot injection is carried out prior to the top dead center of compression, main injection is then carried out beyond the top dead center of compression, and fuel injection quantity and fuel injection timing of the pilot injection are set such that the maximum rate of heat release induced by the pilot injection is 60 kJ/s or less.

Growing community of inventors

Fujisawa, Japan

Naoya Ishikawa